Gusen was a subcamp of Mauthausen concentration camp operated by the SS between the villages of Sankt Georgen an der Gusen and Langestein in the Reichsgau Ostmark. It was primarily populated by Polish
Gusen I after liberation
Construction of barracks at Gusen (1940)
SS men at Gusen, October 1941
Franz Xaver Ziereis was the commandant of the Mauthausen concentration camp from 1939 until the camp was liberated by American forces in 1945.
Ziereis (left) with Heinrich Himmler (center) and Karl Wolff (right) at Mauthausen in 1941